Collaborative Research: An ultra-high-resolution record of drought, flood, and coupled ocean-atmosphere climate oscillations in Holocene and late Quaternary Californian sediments

合作研究：全新世和晚第四纪加利福尼亚沉积物中干旱、洪水和海洋-大气耦合气候振荡的超高分辨率记录

基本信息

批准号：
1542697
负责人：
Linda Hinnov
金额：
$ 4.82万
依托单位：
George Mason University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2015
资助国家：
美国
起止时间：
2015-02-11 至 2018-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1542697&HistoricalAwards=false
关键词：
Collaborative Research ultra resolution record

项目摘要

This research-- a collaborative effort between scientists from the University of Michigan, Johns Hopkins University, the University of California San Diego Scripps Institute of Oceanography, and the University of Minnesota Duluth-- will reconstruct annual rainfall in Southern California during targeted climate intervals over the last 750,000 years. Using existing cores from the Santa Barbara Basin-- a system that receives sediment-laden river discharge following rainfall events, with minimal subsequent bioturbation-- the project will employ scanning X-ray fluorescence to detect siliciclastic material as a proxy for river runoff. Pollen in sediments will be analyzed to further verify wet vs. dry climate conditions. The frequency of multi-year droughts and floods will be determined for key climate intervals, capturing interannual (El Niño-Southern Ocean) and decadal (Pacific Decadal Oscillation) climate modes. Results will be used to assess the response of these climate modes to forcings such as changing CO2 concentrations and variations in orbital cycles. This study will extend the regional climate record well beyond the time period covered by instrumental data, improving our capacity to understand and predict future hydrologic and climate changes. Graduate students will be involved in all aspects of the research, including meeting with collaborators, presenting at national meetings, and publishing papers. The web-based platform Earthguide will host educational materials based on this project for use in primary and secondary school curricula.

这项研究是密歇根大学、约翰霍普金斯大学、加州大学圣地亚哥斯克里普斯海洋学研究所和明尼苏达大学德卢斯分校的科学家们的合作成果，将重建南加州在气候目标间隔期间的年降雨量。该项目将利用圣巴巴拉盆地现有的岩心（该系统在降雨事件后接收富含沉积物的河流排放物，随后的生物扰动极小），利用扫描 X 射线荧光来检测。将分析沉积物中的硅质碎屑物质作为河流径流的代表，以进一步验证潮湿与干燥的气候条件，并将确定关键气候间隔的多年干旱和洪水的频率，捕获年际（厄尔尼诺-南大洋）。）和年代际（太平洋年代际振荡）气候模式的结果将用于评估这些气候模式对二氧化碳浓度变化和轨道周期变化等强迫的响应。远远超出仪器数据覆盖的时间段，提高我们理解和预测未来水文和气候变化的能力，研究生将参与研究的各个方面，包括与合作者会面、在国家会议上发言和在网络上发表论文。基于地球指南的平台将托管基于该项目的教育材料，用于中小学课程。